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microblaze: Fix MB_MANAGER build with older binutils

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Commit 88707ebe77 ("microblaze: Add custom break vector handler for mb
manager") added the suspend mnemonic to the MB Manager break handler.

GNU as only learned this mnemonic in binutils 2.42. Linux supports
binutils 2.30, where enabling CONFIG_MB_MANAGER fails:

  arch/microblaze/kernel/entry.S:946: Error: unknown opcode "suspend"

The suspend mnemonic is an alias for mbar 24, and both encode as
0xbb020004. Use the underlying instruction, which GNU as 2.30 already
supports.

Fixes: 88707ebe77 ("microblaze: Add custom break vector handler for mb manager")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310310151.UhB396Qs-lkp@intel.com/
Suggested-by: Michal Simek <monstr@monstr.eu>
Cc: stable@vger.kernel.org
Assisted-by: Codex:gpt-5.6-sol
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Link: https://patch.msgid.link/20260813024026.5402-1-kmehltretter@gmail.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Karl Mehltretter 2026-08-13 04:40:26 +02:00 committed by Michal Simek
parent cee9395acd
commit 79c8aa4da3
1 changed files with 1 additions and 1 deletions
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2
arch/microblaze/kernel/entry.S
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@ -943,7 +943,7 @@ ret_from_break:
mbar 1
mbar 2
bri 4
suspend
mbar 24 /* suspend */
nop
#endif